LA MALBAIE, Quebec (Reuters) - A move by the United States to explore tariffs on auto imports is based on flimsy logic and is clearly linked to talks to modernize the NAFTA trade pact, Canadian Prime Minister Justin Trudeau said on Thursday.

WASHINGTON (Reuters) - U.S. President Donald Trump on Thursday called off a historic summit with North Korean leader Kim Jong Un scheduled for next month, citing Pyongyang's "open hostility," and warned that the U.S. military was ready in the event of any reckless acts by North Korea.